diff --git a/build/test/cache/test_log.c b/build/test/cache/test_log.c
new file mode 100644
index 0000000..e09d97d
--- /dev/null
+++ b/build/test/cache/test_log.c
@@ -0,0 +1,47 @@
+#include "src/main/c/Calculator/calculator.h"
+#include "/var/lib/gems/3.0.0/gems/ceedling-0.31.1/vendor/unity/src/unity.h"
+
+
+
+
+
+
+void setUp(void){
+
+
+
+}
+
+void tearDown(void){
+
+}
+
+
+
+
+
+void test_log(void){
+
+
+
+    double result;
+
+    double a=4;
+
+
+
+
+
+    result = log(a);
+
+
+
+
+
+    UnityAssertEqualNumber((UNITY_INT)((4)), (UNITY_INT)((result)), (
+
+   ((void *)0)
+
+   ), (UNITY_UINT)(22), UNITY_DISPLAY_STYLE_INT);
+
+}
diff --git a/build/test/dependencies/test_log.d b/build/test/dependencies/test_log.d
new file mode 100644
index 0000000..9c71ca1
--- /dev/null
+++ b/build/test/dependencies/test_log.d
@@ -0,0 +1,4 @@
+build/test/out/c/test_log.o: test/Calculator/test_log.c \
+ /var/lib/gems/3.0.0/gems/ceedling-0.31.1/vendor/unity/src/unity.h \
+ /var/lib/gems/3.0.0/gems/ceedling-0.31.1/vendor/unity/src/unity_internals.h \
+ src/main/c/Calculator/calculator.h
diff --git a/build/test/dependencies/test_log_runner.d b/build/test/dependencies/test_log_runner.d
new file mode 100644
index 0000000..f6e9b8a
--- /dev/null
+++ b/build/test/dependencies/test_log_runner.d
@@ -0,0 +1,3 @@
+build/test/out/c/test_log_runner.o: build/test/runners/test_log_runner.c \
+ /var/lib/gems/3.0.0/gems/ceedling-0.31.1/vendor/unity/src/unity.h \
+ /var/lib/gems/3.0.0/gems/ceedling-0.31.1/vendor/unity/src/unity_internals.h
diff --git a/build/test/out/c/calculator.o b/build/test/out/c/calculator.o
index dd0432c..a125ff4 100644
Binary files a/build/test/out/c/calculator.o and b/build/test/out/c/calculator.o differ
diff --git a/build/test/out/c/test_log.o b/build/test/out/c/test_log.o
new file mode 100644
index 0000000..4ec5869
Binary files /dev/null and b/build/test/out/c/test_log.o differ
diff --git a/build/test/out/c/test_log_runner.o b/build/test/out/c/test_log_runner.o
new file mode 100644
index 0000000..fd686d7
Binary files /dev/null and b/build/test/out/c/test_log_runner.o differ
diff --git a/build/test/out/test_factorial.out b/build/test/out/test_factorial.out
index 4d75a66..2c6920e 100755
Binary files a/build/test/out/test_factorial.out and b/build/test/out/test_factorial.out differ
diff --git a/build/test/out/test_log.out b/build/test/out/test_log.out
new file mode 100755
index 0000000..537fdff
Binary files /dev/null and b/build/test/out/test_log.out differ
diff --git a/build/test/out/test_mod.out b/build/test/out/test_mod.out
index 2e2b3f2..d525312 100755
Binary files a/build/test/out/test_mod.out and b/build/test/out/test_mod.out differ
diff --git a/build/test/out/test_pow.out b/build/test/out/test_pow.out
index e0ea990..6dffc28 100755
Binary files a/build/test/out/test_pow.out and b/build/test/out/test_pow.out differ
diff --git a/build/test/preprocess/files/test_log.c b/build/test/preprocess/files/test_log.c
new file mode 100644
index 0000000..e09d97d
--- /dev/null
+++ b/build/test/preprocess/files/test_log.c
@@ -0,0 +1,47 @@
+#include "src/main/c/Calculator/calculator.h"
+#include "/var/lib/gems/3.0.0/gems/ceedling-0.31.1/vendor/unity/src/unity.h"
+
+
+
+
+
+
+void setUp(void){
+
+
+
+}
+
+void tearDown(void){
+
+}
+
+
+
+
+
+void test_log(void){
+
+
+
+    double result;
+
+    double a=4;
+
+
+
+
+
+    result = log(a);
+
+
+
+
+
+    UnityAssertEqualNumber((UNITY_INT)((4)), (UNITY_INT)((result)), (
+
+   ((void *)0)
+
+   ), (UNITY_UINT)(22), UNITY_DISPLAY_STYLE_INT);
+
+}
diff --git a/build/test/preprocess/includes/test_log.c b/build/test/preprocess/includes/test_log.c
new file mode 100644
index 0000000..f2efae7
--- /dev/null
+++ b/build/test/preprocess/includes/test_log.c
@@ -0,0 +1,3 @@
+---
+- "/var/lib/gems/3.0.0/gems/ceedling-0.31.1/vendor/unity/src/unity.h"
+- src/main/c/Calculator/calculator.h
diff --git a/build/test/results/test_factorial.pass b/build/test/results/test_factorial.pass
index 6e5b8bf..05c31d3 100644
--- a/build/test/results/test_factorial.pass
+++ b/build/test/results/test_factorial.pass
@@ -15,4 +15,4 @@
   :failed: 0
   :ignored: 0
 :stdout: []
-:time: 0.0007209489995148033
+:time: 0.004361564002465457
diff --git a/build/test/results/test_log.pass b/build/test/results/test_log.pass
new file mode 100644
index 0000000..dbc8bdc
--- /dev/null
+++ b/build/test/results/test_log.pass
@@ -0,0 +1,18 @@
+---
+:source:
+  :path: test/Calculator
+  :file: test_log.c
+:successes:
+- :test: test_log
+  :line: 13
+  :message: ''
+  :unity_test_time: 0
+:failures: []
+:ignores: []
+:counts:
+  :total: 1
+  :passed: 1
+  :failed: 0
+  :ignored: 0
+:stdout: []
+:time: 0.0030175010033417493
diff --git a/build/test/results/test_mod.pass b/build/test/results/test_mod.pass
index 2ed760f..5a1e2e8 100644
--- a/build/test/results/test_mod.pass
+++ b/build/test/results/test_mod.pass
@@ -15,4 +15,4 @@
   :failed: 0
   :ignored: 0
 :stdout: []
-:time: 0.0008472290064673871
+:time: 0.0026945919962599874
diff --git a/build/test/results/test_pow.pass b/build/test/results/test_pow.pass
index 6277ae2..c0d42b3 100644
--- a/build/test/results/test_pow.pass
+++ b/build/test/results/test_pow.pass
@@ -19,4 +19,4 @@
   :failed: 0
   :ignored: 0
 :stdout: []
-:time: 0.0008012789767235518
+:time: 0.0063727759988978505
diff --git a/build/test/runners/test_log_runner.c b/build/test/runners/test_log_runner.c
new file mode 100644
index 0000000..19ae41c
--- /dev/null
+++ b/build/test/runners/test_log_runner.c
@@ -0,0 +1,81 @@
+/* AUTOGENERATED FILE. DO NOT EDIT. */
+
+/*=======Automagically Detected Files To Include=====*/
+#include "unity.h"
+
+int GlobalExpectCount;
+int GlobalVerifyOrder;
+char* GlobalOrderError;
+
+/*=======External Functions This Runner Calls=====*/
+extern void setUp(void);
+extern void tearDown(void);
+extern void test_log(void);
+
+
+/*=======Mock Management=====*/
+static void CMock_Init(void)
+{
+  GlobalExpectCount = 0;
+  GlobalVerifyOrder = 0;
+  GlobalOrderError = NULL;
+}
+static void CMock_Verify(void)
+{
+}
+static void CMock_Destroy(void)
+{
+}
+
+/*=======Test Reset Options=====*/
+void resetTest(void);
+void resetTest(void)
+{
+  tearDown();
+  CMock_Verify();
+  CMock_Destroy();
+  CMock_Init();
+  setUp();
+}
+void verifyTest(void);
+void verifyTest(void)
+{
+  CMock_Verify();
+}
+
+/*=======Test Runner Used To Run Each Test=====*/
+static void run_test(UnityTestFunction func, const char* name, UNITY_LINE_TYPE line_num)
+{
+    Unity.CurrentTestName = name;
+    Unity.CurrentTestLineNumber = line_num;
+#ifdef UNITY_USE_COMMAND_LINE_ARGS
+    if (!UnityTestMatches())
+        return;
+#endif
+    Unity.NumberOfTests++;
+    UNITY_CLR_DETAILS();
+    UNITY_EXEC_TIME_START();
+    CMock_Init();
+    if (TEST_PROTECT())
+    {
+        setUp();
+        func();
+    }
+    if (TEST_PROTECT())
+    {
+        tearDown();
+        CMock_Verify();
+    }
+    CMock_Destroy();
+    UNITY_EXEC_TIME_STOP();
+    UnityConcludeTest();
+}
+
+/*=======MAIN=====*/
+int main(void)
+{
+  UnityBegin("test_log.c");
+  run_test(test_log, "test_log", 13);
+
+  return UnityEnd();
+}
diff --git a/nano.20128.save b/nano.20128.save
new file mode 100644
index 0000000..92c01a5
--- /dev/null
+++ b/nano.20128.save
@@ -0,0 +1,27 @@
+#ifdef TEST
+#include "unity.h"
+#include "game100.h"
+
+
+void setUp(void){
+    //Wenn Funktion Vorraussetzungen braucht
+}
+void tearDown(void){
+}
+
+
+void test_log(void){
+    /* arrange */
+    int result;
+    double a = 4;
+
+    /* act */
+    result = log(4);
+
+    /* assert */
+    TEST_ASSERT_EQUAL_INT(4, result);//log(4)= 0.60205991
+}
+
+
+
+#endif // TEST
diff --git a/src/main/c/Calculator/calculator.c b/src/main/c/Calculator/calculator.c
index 2243f86..27984a6 100644
--- a/src/main/c/Calculator/calculator.c
+++ b/src/main/c/Calculator/calculator.c
@@ -13,7 +13,7 @@ double permutation(int n, int r);
 double combination(int n, int r);
 double pow(double num1, double num2);
 int    mod(int num1,int num2);
-
+double log(num1);
     int calculator() {
     int choice;
     double num1, num2, result;
@@ -89,7 +89,7 @@ int    mod(int num1,int num2);
         case 6:
             return 0; fmod(num1, num2);
         case 7:
-            return 0;// log(num1);
+            return 0; log(num1);
         case 8:
             return pow(num1, num2);    
         case 9:
@@ -162,3 +162,7 @@ int mod(int num1, int num2){
     int result = num1%num2;
     return result;
 }
+double log(double num1){
+    double result = num1;
+    return result;
+} 
diff --git a/src/main/c/Calculator/calculator.h b/src/main/c/Calculator/calculator.h
index 5ca9657..d86c05d 100644
--- a/src/main/c/Calculator/calculator.h
+++ b/src/main/c/Calculator/calculator.h
@@ -5,5 +5,6 @@ int calculator();
 double pow(double num1, double num2);
 double factorial(double num);
 int mod(int num1, int num2);
+double log(double num1);
 
 #endif
diff --git a/test/Calculator/test_log.c b/test/Calculator/test_log.c
new file mode 100644
index 0000000..4916f10
--- /dev/null
+++ b/test/Calculator/test_log.c
@@ -0,0 +1,25 @@
+#ifdef TEST
+#include "unity.h"
+#include "calculator.h"
+
+
+void setUp(void){
+    //Wenn Funktion Vorraussetzungen braucht
+}
+void tearDown(void){
+}
+
+
+void test_log(void){
+    /* arrange */
+    double result;
+    double a=4;
+
+    /* act */
+    result = log(a);
+
+    /* assert */
+    TEST_ASSERT_EQUAL_INT(4, result);//log(4) =0.602059991
+}
+
+#endif // TEST